Both men were found inside a car in the 10800 block of Buford Avenue around 2 a.m.
The 34-year-old was shot in the back, the 18-year-old was shot in the arm, and both are believed to be gang members, according to L.A. County sheriff's deputies.
The two men were taken to a hospital. Their conditions were not immediately released.
City News Service contributed to this report.